Scrollpane ruler
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Rectangle;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
public class HeaderDemo extends JFrame {
private JLabel label = new JLabel(new ImageIcon("largeJava2sLogo.gif"));
public HeaderDemo() {
super("JScrollPane Demo");
JScrollPane scrollPane = new JScrollPane(label);
JLabel[] corners = new JLabel[4];
for (int i = 0; i < 4; i++) {
corners[i] = new JLabel();
corners[i].setBackground(Color.white);
corners[i].setOpaque(true);
}
JLabel rowheader = new JLabel() {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Rectangle rect = g.getClipBounds();
for (int i = 50 - (rect.y % 50); i < rect.height; i += 50) {
g.drawLine(0, rect.y + i, 3, rect.y + i);
g.drawString("" + (rect.y + i), 6, rect.y + i + 3);
}
}
public Dimension getPreferredSize() {
return new Dimension(25, (int) label.getPreferredSize()
.getHeight());
}
};
rowheader.setBackground(Color.white);
rowheader.setOpaque(true);
JLabel columnheader = new JLabel() {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Rectangle r = g.getClipBounds();
for (int i = 50 - (r.x % 50); i < r.width; i += 50) {
g.drawLine(r.x + i, 0, r.x + i, 3);
g.drawString("" + (r.x + i), r.x + i - 10, 16);
}
}
public Dimension getPreferredSize() {
return new Dimension((int) label.getPreferredSize().getWidth(),
25);
}
};
columnheader.setBackground(Color.white);
columnheader.setOpaque(true);
scrollPane.setRowHeaderView(rowheader);
scrollPane.setColumnHeaderView(columnheader);
scrollPane.setCorner(JScrollPane.LOWER_LEFT_CORNER, corners[0]);
scrollPane.setCorner(JScrollPane.LOWER_RIGHT_CORNER, corners[1]);
scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, corners[2]);
scrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER, corners[3]);
getContentPane().add(scrollPane);
setSize(400, 300);
setVisible(true);
}
public static void main(String[] args) {
new HeaderDemo();
}
}
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